Constant cyclotron line energy in hercules X–1 - joint insight-HXMT and NuSTAR observations
Xiao, G. C. and Ji, L. and Staubert, R. and Ge, M. Y. and Zhang, S. and Zhang, S. N. and Santangelo, A. and Ducci, L. and Liao, J. Y. and Guo, C. C. and (Insight-HXMT Collaboration), Insight-HXMT and Güngör, Can (2019) Constant cyclotron line energy in hercules X–1 - joint insight-HXMT and NuSTAR observations. Journal of High Energy Astrophysics, 23 . pp. 29-32. ISSN 2214-4048 (Print) 2214-4056 (Online)
Official URL: http://dx.doi.org/10.1016/j.jheap.2019.09.002
The long-term evolution of the centroid energy of the CRSF in Her X-1 is still a mystery. We report a new measurement from a campaign between Insight-HXMT and NuSTAR performed in February 2018. Generally, the two satellites show well consistent results of timing and spectral properties. The joint spectral analysis confirms that the previously observed long decay phase has ended, and that the line energy instead keeps constant around 37.5 keV after flux correction.
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